Beethoven vs van Beethoven

Beethoven and van Beethoven both are nouns.

Word	Noun	Adjective	Verb	Adverb
Beethoven	Yes	No	No	No
van Beethoven	Yes	No	No	No

As nouns, Beethoven and van Beethoven are synonyms defined as:

Beethoven and van Beethoven: German composer of instrumental music (especially symphonic and chamber music); continued to compose after he lost his hearing (1770-1827)

Other synonyms of Beethoven include Ludwig van Beethoven.

Beethoven (noun)	van Beethoven (noun)
the music of Beethoven	German composer of instrumental music (especially symphonic and chamber music); continued to compose after he lost his hearing (1770-1827)
German composer of instrumental music (especially symphonic and chamber music); continued to compose after he lost his hearing (1770-1827)